If I take a 2min Drum and Bass track with 170bpm, add 30s of silence at the beginning and the end it would result in ~113bpm for a track of 3 min. Would this be legal? Or did they also define how to measure the bpm?
Have they defined the planet for the length of the minute? How about a Venus minute? Or a Jupiter minute?
That's not how tempo works. The Music played is still at a tempo of 170 beats per minute.
You wouldn't win if you were pulled over going 50 mph on a 40 mph road by saying that you were stopped at lights for 10 minutes and thus your average speed for the last half hour or whatever is under 40 mph.